Camera doesnt capture viewport in Blender 2.8
From trying to replicate the described problem, I found this potential pitfall (which has been confusing new users for years). The camera actually does move to the new viewpoint, but only shows grey.
If that is the problem you're having... it's because each Camera has its own Clipping Distance limits.



Once you've moved it far enough out, make sure the Camera's Clip End is increased enough so it encloses the distance back to the origin.